Bores about dresses (5)
I believe the answer is:
robes
'dresses' is the definition.
(I know this)
'bores about' is the wordplay.
'about' is an anagram indicator.
'bores' is an anagram of 'ROBES'.
(Other definitions for robes that I've seen before include "'The 19 across 1 across' of the French Revolution" , "In official costume" , "Sober (anag)" , "trappings of office?" , "Attire" .)